The BioDudes handcrafted bioactive substrate for Tarantulas, Scorpions, Spiders, Vinegaroons and other invertebrates. Terra Aranea is a one of a kind substrate that was thoroughly tested for over a year prior to it's release in 2019. Terra Aranea substrate is specifically designed for all biomes that can get very dry and arid or in a high humidity biome. This substrate is designed to hold the perfect amount of water while allowing for evaporation reinforcing positive symbiotic relationships. , which is a common fight when dealing with inverts and terrariums. When used in conjunction with the Bio Shot it encourages the full self-cleaning, self-maintaining bioactive environment, while ensuring your invert gets the exact husbandry they need, without the worry of harmful molds and bacterias. Terra Aranea also retains all burrows and hides. I have found this substrate brings out many of the instinctual niches that many different invertebrates do in their daily life. Not only does it hold a burrow, it also holds a complete tunnel when the moisture content is held at 25%-75%. Terra Aranea provides excellent organic nutrition for your vivarium by creating necessary air pockets for root development and plant health. These air pockets are also necessary for the springtails and isopods to create a sustainable population in the vivarium. Note: Each 6 qt bag of Terra Aranea weights 3.25 lbs. It is recommended to add the Bio Dude's BioShot to promote bioactivity in your substrate. You can also add springtails, isopods, or earwigs. They are not included, only the single bag of handcrafted substrate. To obtain the self-cleaning, self-maintaining aspect you must add at least one of the above mentioned for optimal performance.